ACROSSA. reversed is a prime number
C. multiple of P-down
E. a prime number
G. a square number
H. a square number
I. multiple of R-across
M. multiple of K-across reversed
L. a square number
M. Q-across * E-across reversed * S-across reversed
O. H-across * L-down
Q. a prime number
R. a prime number
S. a square number

DOWNA. palindrome
B. Reversed equals F-down plus O-across reversed
C. a square number
D. a square number
E. a prime number
F. palindrome
J. palindrome
K. multiple of A-down
L. a square number
N. a square number
P. a prime number